The Collaborative International Dictionary of English v.0.48:

Cnemial \Cne"mi*al\, a. [Gr. ? the tibia.] (Anat.)
   Pertaining to the shin bone.
   [1913 Webster]

   Cnemial crest, a crestlike prominence on the proximal end
      of the tibia of birds and some reptiles.
      [1913 Webster]